.c. is becoming the first place in the u.s. to use technology that's already a huge hit overseas. we'll explain how it works. >>> hailing a cab in d.c. is sometimes easier said than done, but don't worry. there's now an app for that. today marked the launch of the my taxi service in the city and you use it on your phone. here's how it works. drivers can sign up to take part in the service. once you sign in to say you need a cab it uses gps to find the closest one to you and sends it your way. at the end of the ride you can pay using paypal or a preloaded credit card on your account. to learn more go to our website www.wusa9.com. >>> white is topping the list of most popular car colors this year. the annual survey by an automotive paint supplier finds that 22% of the cars and trucks built for model year 2012 have white paint. silver vehicles account for 20%. black, gray and red round out the top five. > a woman dying of cancer is hoping her story about the tsa prevents other people from going through the same thing. michelle denage has leukemia and packs a lot of prescription drugs for what she'